HELP! ARE THESE QUERIES EQUIVALENT?

The following query gets executed tens of thousands times.
I need to optimize it.
I thought that the JOIN to thesecond table was unnecessary ... so I rewrote it, and I get exactly the same results with the rewritten query ...
However, I am worried that there may be a few records that may make my rewrite return a different record set.

Appari is right, your two queries aren't the same thing. But you still have a query that isn't meeting your needs anymore.
Here are a few suggestions to try that just may get you closer to the performance that you'd like to see.

In some cases an exists clause can be moderately faster than a join. You might try executing this and looking at your execution times.

Since your table does seem to be pretty big, depending on how often the table is modified, you might be able to create a temp table on the server and query it instead of the original table (or create it if it doesn't exist).

Your inputs opened my eyes and I did the following:
I created an indexed-view ...
... evaluated the tables/db usage, 90/10 ratio of read vs. right, etc.
so, not much concern with keeping both base tables and indexes in sync ...

The following script shows the VIEW that needs to be called in place of the JOIN of the two huge tables:

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